Creep vs player

 Okay, so I am college educated and being in social sciences I learned a lot about gender in society and feminism. In class though I would always hear girls complaining that men hit on them all the time and treated them like objects. Although I could see how all this attention could get old, but at the same time I have to feel for my fellow man. Most of these girls wore suggestive clothing  and as a single man with a brain hard wired to get his sperm out there, how else is a man supposed to find a mate with out coming on to girls? Eventually a man is going to have to sac up and move in for the kill right?... is that being a rapist? Is that sexually harassing them, or is that just the natural play of events. I guess my real question here is where is the line between being a creep and being casual? I mean girls like one nights stands too right? I mean they like sex as much as we do right? surely, contrary to what feminists say, men aren't just a bunch of horny assholes. To god I ask,  what is the moral, reasonable, ethical etc... way to pick up chicks.. i mean women.